asyncio marker works if no event loop is set #65
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There is at least one edge case where there is no event loop when https://github.com/pytest-dev/pytest-asyncio/compare/master...argaen:catch_when_no_loop?expand=1#diff-4d85e8313d8e67cb777137411a11ac86R133 is reached.
When combining pytest-aiohttp and this package (only with 0.6.0 version) tests are crashing saying there is no event loop running. I believe the error is produced because pytest-aiohttp does the following: https://github.com/aio-libs/aiohttp/blob/master/aiohttp/pytest_plugin.py#L145 and then when pytest-asyncio reaches the line where it has to get the loop, there is no loop. This PR provides a try/except for controlling this case.
I was checking previous versions of this package to see why it wasn't crashing but from what I can see it has changed quite a lot